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This change enables the addition of an arbitrary string to the output of GHCi's ':info'. It was made for Coercible in particular but could be extended if desired. Updates haddock submodule. Test Plan: Modified test 'ghci059' to match new output. Reviewers: austin, bgamari Reviewed By: bgamari Subscribers: goldfire, rwbarton, thomie GHC Trac Issues: #12390 Differential Revision: https://phabricator.haskell.org/D3634
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